import java.util.Scanner; import java.text.DecimalFormat; import java.io.*; public class SavingAccount //MUST match the file name! { public static void main(String[] args)throws IOException { //Create a decimal format for displaying dollars DecimalFormat dollar = new DecimalFormat(\"#,###.##\"); //Constants double depositSum = 0.0; double withdrawalSum = 0.0; double earnedInt = 0.0; double startBalance = 500; //Starting balance // Executables System.out.println(\"This program solves Programming Challenge 6.11\"); System.out.println(); //Create Scanner object for keyboard input. Scanner keyboard = new Scanner(System.in); //Get interest rate System.out.print(\"Enter the annual interest: \"); double testInterest = keyboard.nextDouble(); //Create an object that accept the starting balance and annual interest SavingAccount1 account = new SavingAccount1(startBalance, testInterest); //Open Deposit file. File file = new File (\"BankDeposits.txt\"); Scanner inputFile = new Scanner(file); //Read line in file while (inputFile.hasNext()); { //Read numbers double num = inputFile.nextDouble(); //Add the numbers depositSum += num; } //Deposit the file input. account.deposit(depositSum); //Close the file inputFile.close(); //Open Withdrawal file File file2 = new File(\"BankWithdrawal.txt\"); Scanner inputFile2 = new Scanner(file2); //Read lines in file while (inputFile2.hasNext()); { //Read numbers double num2 = inputFile2.nextDouble(); //Add the numbers withdrawalSum += num2; } //Withdrawal the file input from account. account.withdraw(withdrawalSum); //Close the file inputFile2.close(); //Add the monthly interest account.addInt(); //Get amount of interest earned. earnedInt += account.getInterest(); //Display the data System.out.println(\"Account balance $\" + dollar.format(account.getBalance())); System.out.println(\"Total interest earned $\" + dollar.format(account.getInterest())); } }//end class public class SavingAccount1 //MUST match the file name! { public static void main(String[] args) { System.out.println(\"This program solves Programming Challenge 6.10\"); System.out.println(); } //Fields private double balance; //Account balance private double annualInterest; //annual interest private double monthInt; //monthly interest private double earnedInt; //earned interest double totalWithdraw; double totalDeposit; /** 018 This constructor sets the starting balance 019 and the annual interest at 0.0. 020 */ public void Ward_Tassinda_SavingAccount1() { balance = 0.0; annualInterest = 0.0; } /** 029 This constructor set the starting balance and the annual interest rate 030 to the value passed as an argument. 031 @param startBalance The starting balance. 032 */ public void Ward_Tassinda_SavingAccount1(double startBalance, double interestRate) { balance = startBalance; annualInterest = interestRate; } /** 041 This constructor sets the starting balance to 042 the value in the String argument. 043 @param str The starting balance, as a String. 044 */ public void .

1. import java.util.Scanner;
import java.text.DecimalFormat;
import java.io.*;
public class SavingAccount //MUST match the file name!
{
public static void main(String[] args)throws IOException
{
//Create a decimal format for displaying dollars
DecimalFormat dollar = new DecimalFormat("#,###.##");
//Constants
double depositSum = 0.0;
double withdrawalSum = 0.0;
double earnedInt = 0.0;
double startBalance = 500; //Starting balance
// Executables
System.out.println("This program solves Programming Challenge 6.11");
System.out.println();
//Create Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
//Get interest rate
System.out.print("Enter the annual interest: ");
double testInterest = keyboard.nextDouble();
//Create an object that accept the starting balance and annual interest
SavingAccount1 account = new SavingAccount1(startBalance, testInterest);
//Open Deposit file.
File file = new File ("BankDeposits.txt");
Scanner inputFile = new Scanner(file);
//Read line in file
while (inputFile.hasNext());
{
//Read numbers
double num = inputFile.nextDouble();
//Add the numbers
depositSum += num;
}

2. //Deposit the file input.
account.deposit(depositSum);
//Close the file
inputFile.close();
//Open Withdrawal file
File file2 = new File("BankWithdrawal.txt");
Scanner inputFile2 = new Scanner(file2);
//Read lines in file
while (inputFile2.hasNext());
{
//Read numbers
double num2 = inputFile2.nextDouble();
//Add the numbers
withdrawalSum += num2;
}
//Withdrawal the file input from account.
account.withdraw(withdrawalSum);
//Close the file
inputFile2.close();
//Add the monthly interest
account.addInt();
//Get amount of interest earned.
earnedInt += account.getInterest();
//Display the data
System.out.println("Account balance $" + dollar.format(account.getBalance()));
System.out.println("Total interest earned $" + dollar.format(account.getInterest()));
}
}//end class
public class SavingAccount1 //MUST match the file name!
{
public static void main(String[] args)
{
System.out.println("This program solves Programming Challenge 6.10");
System.out.println();
}
//Fields

3. private double balance; //Account balance
private double annualInterest; //annual interest
private double monthInt; //monthly interest
private double earnedInt; //earned interest
double totalWithdraw;
double totalDeposit;
/**
018
This constructor sets the starting balance
019
and the annual interest at 0.0.
020
*/
public void Ward_Tassinda_SavingAccount1()
{
balance = 0.0;
annualInterest = 0.0;
}
/**
029
This constructor set the starting balance and the annual interest rate
030
to the value passed as an argument.
031
@param startBalance The starting balance.
032
*/
public void Ward_Tassinda_SavingAccount1(double startBalance, double interestRate)
{
balance = startBalance;
annualInterest = interestRate;
}
/**
041
This constructor sets the starting balance to
042

4. the value in the String argument.
043
@param str The starting balance, as a String.
044
*/
public void Ward_Tassinda_SavingAccount1(String str)
{
balance = Double.parseDouble(str);
}
/**
052
The deposit method makes a depositinto
053
the account.
054
@param amount The amount to add to the balance field.
055
*/
public void deposit(double amount)
{
balance += amount;
totalDeposit += amount;
}
/**
064
The deposit method makes a deposit into the account.
065
@param str The amount to add to the balance field,
066
as a String.
067
*/
public void deposit (String str)
{
balance += Double.parseDouble(str);

5. }
/**
075
The withdraw method withdraws an amount from
076
the account.
077
@param amount The amount to subtract from the
078
balance field.
079
*/
public void withdraw (double amount)
{
balance -= amount;
totalWithdraw += amount;
}
/**
088
The withdraw method withdraws an amount from
089
the account.
090
@param str The amount to subtract from the
091
balance field, as a String.
092
*/
public void withdraw (String str)
{
balance -= Double.parseDouble(str);
}
/**
100
The addInt method calculates the montly
101

6. interest in the account.
102
@param monthlyInterest The annual interest
103
divided by 12.
104
*/
public void addInt()
{
monthInt = ((annualInterest/100) / 12);
balance += earnedInt;
earnedInt += (monthInt * balance);
}
/**
114
The setBalance method sets the account balance.
115
@param b The value to store in the balance field.
116
*/
public void setBalance(double b)
{
balance = b;
}
/**
124
The setBalance method sets the account balance.
125
@param str The value, as a String, to store in
126
the balance field.
127
*/
public void setBalance(String str)
{
balance = Double.parseDouble(str);

7. }
/**
135
The setInterest method sets the account's
136
monthly interest.
137
@param i The value to store in the interest field.
138
*/
public void setInterest (double i)
{
earnedInt = i;
}
public void setInterest (String str)
{
earnedInt = Double.parseDouble(str);
}
/**
151
The getBalance method returns the
152
account balance.
153
@return The value in the balance field.
154
*/
public double getBalance()
{
return balance;
}
/**
162
The getInterest method returns the
163
earned interest.

8. 164
@return The value in the interest field.
165
*/
public double getInterest()
{
return earnedInt;
}
}//end class
Solution
import java.util.Scanner;
import java.text.DecimalFormat;
import java.io.*;
public class SavingAccount //MUST match the file name!
{
public static void main(String[] args)throws IOException
{
//Create a decimal format for displaying dollars
DecimalFormat dollar = new DecimalFormat("#,###.##");
//Constants
double depositSum = 0.0;
double withdrawalSum = 0.0;
double earnedInt = 0.0;
double startBalance = 500; //Starting balance
// Executables
System.out.println("This program solves Programming Challenge 6.11");
System.out.println();
//Create Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
//Get interest rate
System.out.print("Enter the annual interest: ");
double testInterest = keyboard.nextDouble();
//Create an object that accept the starting balance and annual interest
SavingAccount1 account = new SavingAccount1(startBalance, testInterest);

9. //Open Deposit file.
File file = new File ("BankDeposits.txt");
Scanner inputFile = new Scanner(file);
//Read line in file
while (inputFile.hasNext());
{
//Read numbers
double num = inputFile.nextDouble();
//Add the numbers
depositSum += num;
}
//Deposit the file input.
account.deposit(depositSum);
//Close the file
inputFile.close();
//Open Withdrawal file
File file2 = new File("BankWithdrawal.txt");
Scanner inputFile2 = new Scanner(file2);
//Read lines in file
while (inputFile2.hasNext());
{
//Read numbers
double num2 = inputFile2.nextDouble();
//Add the numbers
withdrawalSum += num2;
}
//Withdrawal the file input from account.
account.withdraw(withdrawalSum);
//Close the file
inputFile2.close();
//Add the monthly interest
account.addInt();
//Get amount of interest earned.
earnedInt += account.getInterest();
//Display the data
System.out.println("Account balance $" + dollar.format(account.getBalance()));

10. System.out.println("Total interest earned $" + dollar.format(account.getInterest()));
}
}//end class
public class SavingAccount1 //MUST match the file name!
{
public static void main(String[] args)
{
System.out.println("This program solves Programming Challenge 6.10");
System.out.println();
}
//Fields
private double balance; //Account balance
private double annualInterest; //annual interest
private double monthInt; //monthly interest
private double earnedInt; //earned interest
double totalWithdraw;
double totalDeposit;
/**
018
This constructor sets the starting balance
019
and the annual interest at 0.0.
020
*/
public void Ward_Tassinda_SavingAccount1()
{
balance = 0.0;
annualInterest = 0.0;
}
/**
029
This constructor set the starting balance and the annual interest rate
030
to the value passed as an argument.
031
@param startBalance The starting balance.

11. 032
*/
public void Ward_Tassinda_SavingAccount1(double startBalance, double interestRate)
{
balance = startBalance;
annualInterest = interestRate;
}
/**
041
This constructor sets the starting balance to
042
the value in the String argument.
043
@param str The starting balance, as a String.
044
*/
public void Ward_Tassinda_SavingAccount1(String str)
{
balance = Double.parseDouble(str);
}
/**
052
The deposit method makes a depositinto
053
the account.
054
@param amount The amount to add to the balance field.
055
*/
public void deposit(double amount)
{
balance += amount;
totalDeposit += amount;
}
/**

12. 064
The deposit method makes a deposit into the account.
065
@param str The amount to add to the balance field,
066
as a String.
067
*/
public void deposit (String str)
{
balance += Double.parseDouble(str);
}
/**
075
The withdraw method withdraws an amount from
076
the account.
077
@param amount The amount to subtract from the
078
balance field.
079
*/
public void withdraw (double amount)
{
balance -= amount;
totalWithdraw += amount;
}
/**
088
The withdraw method withdraws an amount from
089
the account.
090
@param str The amount to subtract from the
091

13. balance field, as a String.
092
*/
public void withdraw (String str)
{
balance -= Double.parseDouble(str);
}
/**
100
The addInt method calculates the montly
101
interest in the account.
102
@param monthlyInterest The annual interest
103
divided by 12.
104
*/
public void addInt()
{
monthInt = ((annualInterest/100) / 12);
balance += earnedInt;
earnedInt += (monthInt * balance);
}
/**
114
The setBalance method sets the account balance.
115
@param b The value to store in the balance field.
116
*/
public void setBalance(double b)
{
balance = b;
}
/**

14. 124
The setBalance method sets the account balance.
125
@param str The value, as a String, to store in
126
the balance field.
127
*/
public void setBalance(String str)
{
balance = Double.parseDouble(str);
}
/**
135
The setInterest method sets the account's
136
monthly interest.
137
@param i The value to store in the interest field.
138
*/
public void setInterest (double i)
{
earnedInt = i;
}
public void setInterest (String str)
{
earnedInt = Double.parseDouble(str);
}
/**
151
The getBalance method returns the
152
account balance.
153
@return The value in the balance field.

15. 154
*/
public double getBalance()
{
return balance;
}
/**
162
The getInterest method returns the
163
earned interest.
164
@return The value in the interest field.
165
*/
public double getInterest()
{
return earnedInt;
}
}//end class